When programming for an STM32 board, e.g. Generic STM32F103C, where does the environment come from? RCC, GPIO adresses etc.? While I can compile a simple blinky program which uses PC13 as the only define coming from the environment, I cannot use symbols like RCC, GPIOA_MODER etc.

OK, I installed the other package. Can I choose STMCubeProgrammer (DFU) as upload method? How can I tell that the STM103C8T6 possible has 128K of Ram? (or is that flash?)

[image] krischu: Can I choose STMCubeProgrammer (DFU) as upload method? With some STM32 series chips you can using the factory built-in bootloader. However, this does not apply to the one you are using (STM32F103C8T6). This may help: https://github.com/stm32duino/wiki/wiki/Upload-methods#stm32cubeprogrammer . I personally use the SWD method with a cheap ST-Link V2 programmer. Try with 128KB flash. I think you get a clear warning if there is a mismatch.

[image] 6v6gt: this does not apply to the one you are using (STM32F103C8T6). Why it doesnot apply?? stm32f103 has built-in DFU bootloader too. I used DFU for uploading firmware to F103C8 and F103C6 very well.

[image] krischu: STM103C8T6 possible has 128K of Ram? (or is that flash?) It is flash. Size of the RAM is not affected by this options and it is 20k for all C8 boards

[image] b707: stm32f103 has built-in DFU bootloader too. I used DFU for uploading firmware to F103C8 and F103C6 very well. OK. Then I made an error. You can do that with the factory installed bootloader and using a USB cable ?

[image] 6v6gt: You can do that with the factory installed bootloader and using a USB cable ? Sure, I used DFU with standard USB, but I am not quite sure ether the bootloader was factory installed or I did updated it myself. I will unpack the new bluepill board to check the DFU and share the results tomorrow

[image] 6v6gt: You can do that with the factory installed bootloader and using a USB cable ? I just tested it, as promised. I open new packed bluepill and try to upload the code with DFU-upload option in Arduino-IDE. Unfortunately, it didn't work that way This means. that there is no built-in bootloader in bluepil and you need to download it in the board first. I did this before, but from some point it began to seem to me that this was not necessary :slight_smile: Installing bootloader procedure is described here. I use DFU-upload all the time. For bluepil this is my main loading method, unlike blackpil (STM32F401/411 boards) where I use st-link

One of the reasons I now use the ST-link V2 is (a) that it is dirt cheap and (b) that my experience with the Bluepill started with the Roger core and there I followed all sorts of instructions and procedures such as registering at various sites and download bits and pieces of software until I had completely lost the overview of what I had done. It did work, even directly over USB as far as I remember, that is until Roger Clark abandoned the whole thing. When the STmicroelectronics core came a long, I had a big clean up and focussed on the SWD / ST-Link upload method which is also used by many of the STmicroelectronics boards (Nucleo etc.). That just works without finding special bootloaders and fiddling around with jumpers etc. The only thing that has not changed is the persistent spam mail I get from STmicroelectronics as a result of the mandatory registration at their site.

How recognizable. Have a bag of Bluepills lying around from all sorts of fakes to a few DIY genuine STM ones. I don't use them often, so I can never remember what bootloader I put on them last time. So in the end I settled on ST-Link V2 so I never have to solve the bootloader puzzle.

[image] 6v6gt: my experience with the Bluepill started with the Roger core I am still using Roger core for blue- and blackpills boards... I just can’t force myself to switch to a new kernel from STM.

Stm32duino environment, defines, includes?

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Stm32duino environment, defines, includes?

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